CN1662685A

CN1662685A - Attenuating fluid manifold for meltblowing die

Info

Publication number: CN1662685A
Application number: CN038142872A
Authority: CN
Inventors: S·C·艾利克森; J·C·布莱斯特
Original assignee: 3M Innovative Properties Co
Current assignee: 3M Innovative Properties Co
Priority date: 2002-06-20
Filing date: 2003-04-21
Publication date: 2005-08-31
Anticipated expiration: 2023-04-21
Also published as: EP1513969A1; DE60329595D1; KR101031935B1; CA2490221A1; CN1309883C; ATE445035T1; KR20050016569A; US6861025B2; EP1513969B1; AU2003225107A1; WO2004001104A1; US20030234464A1; MXPA04012350A; JP2005530058A

Abstract

Melt blown nonwoven webs are formed by supplying attenuating fluid to a meltblowing die (12) through an attenuating fluid distribution passage whose distribution characteristics can be changed while the die (12) and manifold (22) are assembled. By adjusting the distribution characteristics of the passage, the mass flow rate of attenuating fluid to channels in the meltblowing die (12) and the temperature of the attenuating fluid at the die outlets (18) can be made more uniform.

Description

Be used for melt and extrude the fluid attenuating manifold that blows the drawing-die tool

Invention field

The present invention relates to be used for melt is extruded and blown and draw (melt blown) to become the apparatus and method of fiber.

Background technology

Nonwoven fabric (nonwoven web) is extruded with a kind of melt typically and is blown and is pulled through that journey makes, in this process, extrude various filaments from various aperture of mould on one side, with hot-air or other can impel the fluid that attenuate make filament be refined into fiber on one side.Make by the fiber of refinement one be arranged at a distance the gathering plate or other suitable surface on form non-textile fabric.

Constantly making great efforts to improve the uniformity of non-textile fabric so far always.Typically, be according to the uniformity of estimating non-textile fabric such as factors such as basis weight, fiber diameter, fabric thickness or permeabilities.For improving the uniformity of non-textile fabric, can change or control such as material extrusion capacity, air mass flow, porous mold to the process variables such as distance of assembling plate.In addition, also can change melt and extrude the project organization that blows drawing device.United States Patent(USP) Nos. 4,889,476; 5,236,641; 5,248,247; 5,260,033; 5,582,907; 5,728,407; This class corrective measure has been described in 5,891,482 and 5,993,943.

Fluid attenuating supplies to the manifold (for example air manifold) of the side of being fixed in die ontology typically, randomly make flow through winding raod footpath in manifold or the die ontology of fluid attenuating again, make it flow through the fluid attenuating flow channel then and near the filament aperture, flow out, draw the filament that is extruded and make it to become fiber so that fluid attenuating can collide and blow.Various representational manifolds, winding raod footpath and flow channel are seen for example United States Patent(USP) Nos. 4,889,476; 5,080,569; 5,098,636; 5,248,247; 5,260,033; 5,580,581; 5,607,701; 5,632,938; 5,667,749; 5,711,970; 5,725,812; 6,001,303 and 6,182,732.

Although many researchers of each side have done the effort in many years, but the manufacturing of the non-textile fabric that is suitable in the industry and commerce still requires careful adjustment process variable and device parameter, and often need carry out the trial and error operation, so that obtain gratifying result.The uniform wide cut melt of character extrusion blow shaping non-textile fabric may especially be difficult to make.

Brief description

Fig. 1 is that melt of the present invention is extruded the schematic end sectional view of blowing the drawing-die tool.

Fig. 2 is that the melt that is used in Fig. 1 is extruded the schematic side elevation that blows the air manifold adjusted in the drawing-die tool.

Fig. 3 is that the melt that is used in Fig. 1 is extruded the schematic side elevation that blows another air manifold adjusted in the drawing-die tool.

Fig. 4 is that another melt of the present invention is extruded the schematic end sectional view of blowing the drawing-die tool.

Fig. 5 is that the melt that is used in Fig. 4 is extruded the schematic perspective view of blowing the air manifold adjusted in the drawing-die tool.

Fig. 6 is that the melt that is used in Fig. 4 is extruded the schematic perspective view of blowing another air manifold adjusted in the drawing-die tool.

Fig. 7 is that the melt that is used in Fig. 4 is extruded the schematic perspective view of blowing another air manifold adjusted in the drawing-die tool.

Fig. 8 is that the melt that is used in Fig. 4 is extruded the schematic perspective view of blowing another air manifold adjusted in the drawing-die tool.

Summary of the invention

Though the macroscopic property of non-textile fabric is useful such as basis weight, fiber diameter, fabric thickness or permeability etc., these character can not provide all the time in order to estimate quality and inhomogeneity enough foundations of non-textile fabric.These macroscopic properties of non-textile fabric are typically by downcutting little sample piece or measuring with the various piece that sensor is monitored moving non-textile fabric from the each several part of non-textile fabric.These methods are very sensitive to sampling and the measure error that may distort measurement result, and when being used to estimate the non-textile fabric that basis weight is low or the title permeability is high, situation is especially true.In addition, though non-textile fabric can show the measured value of uniform basis weight, fibre diameter, thickness or permeability, but non-textile fabric may be because the difference of the refinement state of indivedual non-textile fabric fibers shows uneven Performance Characteristics.If the filament that each root is extruded stands identical or substantially the same short thin air-flow, then can produce more uniform non-textile fabric.Say ideally, should make short thin air-flow to collide filament along identical volume flow of the width of mould and temperature.After refinement and assembling, formation by refinement each root fiber of fiber between the more physical property of homogeneous is arranged, thereby can produce the higher or more uniform melt of quality and extrude to blow and pull into the shape non-textile fabric.

Desirable fibrous physics character homogeneity can be preferably estimated by the physics or the chemical property of one or more inherences of measuring the fiber of assembling, for example measure their basis weight mean value or number average molecular weight, and the molecular weight distribution of more preferably measuring them.Can characterize molecular weight distribution easily with polydispersity.By measuring the character of fiber rather than web swatches, can reduce sampling error, and can more accurately measure the quality or the uniformity of non-textile fabric.

One aspect of the present invention provides a kind of melt to extrude to blow drawing device, and it comprises:

A) melt is extruded and is blown the drawing-die tool, and this melt is extruded and blown drawing-die and have the outlet of (i) many filaments and (ii) many short thin air current flow passages, and near on these flow channels and the mould each filament outlet many are urged thin air stream outlet fluid and are communicated with;

B) manifold that is communicated with many short thin air current flow passage fluids, this manifold has at least one short thin airflow inlet; And

C) the short thin air-flow distribution passage between the short thin air stream outlet of manifold entrance and correspondence wherein, can change the distribution character of path, so that the more uniform temperature of the short thin air-flow in each flow channel when assembly jig and manifold.

On the other hand, the invention provides a kind of method that is used to make the fibroid non-textile fabric, it comprises:

A) make the fiber forming material melt of flowing through extrude and blow the drawing-die tool, this melt is extruded and is blown drawing-die and have the outlet of (i) many filaments and (ii) many short thin air current flow passages, and near on these flow channels and the mould each filament outlet many are urged thin air stream outlet fluid and are communicated with;

B) make the import of urging at least one manifold that is communicated with many flow channel fluids of thin airflow passes; And

C) distribution character of the short thin air-flow distribution passage between the short thin air stream outlet of change manifold entrance and correspondence when assembly jig and manifold is so that the more uniform temperature of the short thin air-flow in each gas channel.

Apparatus and method of the present invention can be produced the higher or more uniform melt of quality and extrude to blow and pull into the shape non-textile fabric, comprise that its each root constitutes between fiber the more non-textile fabric of the physical property of homogeneous is arranged.Can extrude to blow at various short thin air flow rate and melt and adjust apparatus and method of the present invention under the drawing-die tool duty, blow the drawing-die tool uniformly short thin air-flow is provided so as to extruding for melt.Each preferred embodiment of the present invention allows to extrude to blow in the process of drawing and adjust carrying out melt.

Describe in detail

With regard to the usage in this specification, term " non-textile fabric " is meant the fibrous web with characterized by entanglement, and it preferably has enough cohesive force and self-supporting intensity.

Term " melt is extruded to blow and drawn " is meant a kind of method that is used to make non-textile fabric, this method is: the fiber forming material of fusing is extruded by many apertures formed filament on one side, make on one side the filament ingress of air of formation or other can impel the fluid of filament refinement, so that filament is refined into fiber, subsequently refinement fibril aggregation become a fibrage.

Phrase " melt is extruded and blown La Wendu " is meant carrying out typical melt and extrudes and blow when drawing melt and extrude the temperature of blowing the drawing-die tool.According to the application scenario, this temperature may be up to 315 ℃, and 325 ℃, even 340 ℃ or higher.

Phrase " melt is extruded and blown the drawing-die tool " is meant that being used to carry out melt extrudes and blow the mould that is pulled through journey.

Term " path " is meant that melt is extruded and blows in the drawing-die tool or the enclosure space in the short thin air-flow manifold, short these spaces of thin airflow passes.

Term " distribution passage " is meant that melt extrudes the path that blows in drawing-die tool or the short thin air-flow manifold, and it is communicated in many short thin air stream outlets and can influences the mass flow that short thin air-flow flows out from these outlets.

Term " distribution character " is meant from the relative mass flow of the short thin air-flow of many short thin air stream outlets outflows.

Phrase " changes when assembly jig and manifold " and is meant manifold being fixed in melt and extrudes the distribution character that changes distribution passage when blowing the drawing-die tool.This phrase not to comprise in order adjusting and may be temporarily to pull down other part from mould or manifold, such as heat screen, thermal insulation board, import and export cover plate, or the like.

Term " melt blow out fiber " is meant to extrude to blow with melt and is pulled through the fiber that journey is made.The shape that melt is blown out fiber is infinitely great (generally being about 10,000 or higher at least) than (ratio of length over diameter) basically, and certainly, it is discontinuous also having report to claim melt to blow out fiber.These fibers are very long and involve together fully, blow out fiber to such an extent as to can not extract a complete melt usually out from a large amount of this fibers, also can not find out a fiber from the beginning to the end.

Phrase " is refined into fiber to filament " and is meant a filament is transformed into the littler filament of length longer dia.

Term " polydispersity " is meant the number average molecular weight of a kind of weight average molecular weight of polymer divided by this polymer, and weight average molecular weight and number average molecular weight all are to estimate with the standard of colloid permeation chromatography and polystyrene.

Phrase " fiber of polydispersity is uniformly arranged basically " and is meant the difference of the average polydispersity of its polydispersity and fiber be no more than ± 5% melt blows out fiber.

Fig. 1 is that the line 1-1 in Fig. 2 cuts open the melt of getting of the present invention and extrudes the schematic end sectional view of blowing drawing device 10.Fig. 2 is that the line 2-2 in Fig. 1 cuts open the side view cutaway drawing that the melt of getting is extruded a part of blowing drawing device 10.With reference to Fig. 1 and 2, melt is extruded and is blown drawing device 10 and comprise that the melt that is made of two

mold half

12a and 12b is extruded and blow drawing-die tool 12.Fiber forming material (for example thermoplastic polymer) enters melt via import 13 and extrudes and blow drawing-die tool 12, advance by

path

14,15 and removable termination 16, the many outlets that closely are provided with via the width interval along mould 12 then (such as outlet 18) are flowed out mould 12 and are become filament.

Fluid attenuating (Re air typically) arrives the import 21a and the 21b at the two ends of manifold 22 from pipeline 20a and 20b.Each manifold extends and center line 42 corresponding to the mid point of mould 12 is arranged roughly along the width of mould 12.Fluid attenuating is turned to and enters a succession of aperture 26 that is provided with along manifold lower wall 27 compartment of terrains by roof 24a movably and 24b after flowing through import 21a and 21b.Then fluid attenuating is directly advanced along winding raod and is walked around

baffle plate

28 and 30 and enter the many fluid attenuating passages (such as 32a and 32b) that are provided with along the width interval ground of mould 12.Fluid attenuating flows through the thermocouple such as thermocouple 34 in some passage, then extrudes and blows drawing-die tool 12 by near many fluid attenuating outlets (such as

fluid attenuating outlet

36a and 36b) the outflow melt that the compartment of terrain is provided with termination 16 of the width along mould 12.

Do not having movably under the

roof

24a and 24b and the situation of other possible influence factor such as the adjustable heat entering apparatus that can be embedded in 12 li on mould, the temperature and pressure of the fluid attenuating that manifold is 22 li will be the length variations along manifold 22.Because fluid attenuating will be extruded (supposition wall 24a do not exist with 24b) at each aperture 26 place from manifold 22, the temperature and pressure of the fluid attenuating that manifold is 22 li is higher near entrance point 21a and 21b place, and lower near center line 42 places.This temperature and pressure difference will cause the mass flow differential of the correspondence of the fluid attenuating that flows through aperture 26, and will be big near the mass flow in the place of entrance point 21a and 21b, and little near the mass flow in the place of center line 42.Suppose that therefore producing constant compression force between aperture 26 and the fluid attenuating outlet such as

outlet

36a and 36b falls, the temperature of the fluid attenuating of fluid attenuating passage (such as

passage

32a and 32b) lining will be the wide variety along mould 12 so, will produce uneven melt like this and blow out non-textile fabric.

Movably

roof

24a and 24b and adjustment bolt 38 can preferably be used to compensate such temperature and pressure variation, can be preferably be transported to

passage

32a and 32b to fluid attenuating uniformly, and can preferably allow to carry out the fluid attenuating mass flow in fluid attenuating exit and temperature difference adjustment, reduce and even vanishing.Movably

roof

24a and 24b are fixed in manifold 22 with their outboard ends via hinges 44.In adjustment position shown in Figure 2, movably the inner of

roof

24a and 24b almost contacts with each other at center line 42 places.The sidewall 23a of import 21a, roof 24a, diapire 27 and manifold 22 and 23b roughly form the path 48 of definite shape, and this path helps balance to flow through the mass flow of fluid attenuating aperture 26 from service 20a.The area of section of path 48 near center line 42 places is being minimum near import 21a place for maximum.The area of section that reduces at center line 42 places can make the fluid attenuating pressure and temperature at this place not reduce, and if not so, extrudes from aperture 26 when the pressure and temperature at this place will flow to center line 42 because of fluid attenuating and reduces.Equally, the sidewall 23a of import 21b, roof 24b, diapire 27 and manifold 22 and 23b roughly form the path 50 of definite shape, and this path helps balance to flow through the mass flow of fluid attenuating aperture 26 from service 20b.

By being screwed into respect to manifold 22 or the movably bolt 38 of back-outing, can adjust the distribution character of path 48 and 50, so that fluid attenuating mass flow and temperature in each passage of mould 12 are more even.Bolt 38 was twisted screwed hole on the fixed top wall 25 of manifold 22 and on the throne by locking nut 40 lockings.The lower end of bolt 38 can freely be rotated in the unthreaded hole on the long friction block 46.The lower surface of friction block 46 withstands on the inner of roof 24a and 24b.The fluid pressure (for example air pressure) that enters the fluid attenuating of manifold 22 can make the inner of

roof

24a and 24b firmly lean against on the lower surface of friction block 46.Along with bolt 38 is screwed into or the manifold 22 of back-outing, path 48 and 50 distribution character will change.For the given fluid attenuating volume flow that enters manifold 22, usually can find suitable bolt 38 desired locations and the path 48 of correspondence and 50 shape, along the length of manifold 22 equally distributed fluid attenuating mass flow and uniform fluid attenuating temperature be arranged in each exit of fluid attenuating so as to making.Can verify whether reached desirable path distribution character such as the temperature of the fluid attenuating in several fluid flowing passages of

passage

32a and 32b by using a plurality of thermocouple sensors 34 monitorings of arranging along the width of mould 12.

Extrude and blow the detailed description of drawing about carry out melt with such device, see for example above-mentioned patent and " industrial engineering chemistry (Industrial Engineering Chemistry) ", the 48th volume, the Wente of publication among the 1324th page of etseq. (1956), the report Report No.4364 of the Naval Research Labratory (NavalResearch Laboratories) that the article of Van A. " superfine thermoplastic fiber (SuperfineThermoplastic Fibers) " or May 25 in 1954 publish, exercise question is " manufacturing of superfine organic fiber (Manufacture of Superfine Organic Fibers) ", the author is Wente, V.A; Boone, C.D. and Fluharty, E.L..

Fig. 3 is used in melt shown in Figure 1 to extrude the schematic side elevation that the another kind that blows in the drawing-die tool can be adjusted air manifold 52.Manifold 52 has the single import 53 of reception through the next fluid attenuating of pipeline 56 supplies.The blind end 55 of manifold 52 is infeeded 56 compressed air by the road.When the air pressure in space 59 surpasses the fluid attenuating pressure of 60 li in path of definite shape, the slidably wedge plungers 57 that sealing ring 58 is housed is just to import 53 motions, and when the fluid attenuating pressure of 60 li in the path of definite shape surpassed air pressure in the space 59, this piston just moved to blind end 55.When two pressure equated, piston 57 just was in an equilbrium position of 51 li in manifold.The distribution character of path 60 is generally decided by the fixed top wall 61 of import 53, manifold, oblique piston face 62, the lower wall 63 and the sidewall of manifold 52.By adjusting air pressure regulator 64, can change the position of piston 57 and then change the distribution character of path 60, thereby the mass flow of the fluid attenuating that flows through the many apertures 66 that are provided with at interval along the length of manifold is evenly distributed and make the fluid attenuating temperature of the short thin air flow outlet of mould 12 reach even.

Fig. 4 is that melt of the present invention is extruded the schematic end sectional view of blowing drawing device 70.Device 70 comprises that the melt that is made of two

mold half

72a and 72b is extruded and blows drawing-die tool 72.Fiber forming material enters melt from import 73 and extrudes and blow drawing-die tool 72, flows through

path

74,75 and removable termination 96, and flows out mould 72 by many filaments outlets (such as outlet 78) that the width interval along mould 72 closely is provided with.

With reference to Figure 4 and 5, fluid attenuating enters sleeve steel manifold 82 from the pipeline such as pipeline 80a and 80b.In the 84a of cylindrical chamber and 84b that two installing rings 102 are centered in manifold 82 to process on mold half 72a and 72b.Manifold 82 extends the whole width of mould 72.Fluid attenuating flows out each manifold 82 by the path of cone tank 86 forms, by inwardly or outwards adjusting the distribution character that bolt 94 can change path with respect to mould 12.Locking nut 96 can be on the throne with bolt 94 lockings of adjusting.Block 98 withstands on the inboard outer wall of each manifold 82.When inwardly twisting bolt 94 and since the sidewall of manifold inwardly scratch change, the place near the center line of manifold 82 of path 86 narrow down (thereby the shape of path 86 and distribution character also change).When outwards twisting bolt 94, path 86 broadens, and its shape roughly returns to its original appearance.

Path 86 shown in Figure 5 typically needn't big opening of flare up or the very serious tapering of title.As an example, when 1.2 meters wide melts are extruded the manifold 82 that blows on the drawing-die tool with two diameter 38mm, preferably, the width range of the close manifold entrance end of path 86 is 0.6-2mm, and is about 1.8-3.5mm at the width range of manifold midline; More preferably, the width range of close manifold entrance end is 1.3-1.8mm, and is about 2.1-2.8mm at the width range of manifold midline.Usually the size of path is changed 1mm or smallerly just can obtain a suitable adjusting range.Can change the distribution character of path with various guiding mechanisms.Representative replacement scheme as roof pressure bolt 94 shown in Figure 4, can get into or withdraw from path 86 with a wedge shape part in the midline of manifold 82, the also at least a portion that can clamp manifold 82 with a clip, the tractive bolt that right-handed thread and left hand thread perhaps can be arranged respectively with two ends, its two ends are threadedly connected to two sidewalls of manifold 82, two sidewalls are furthered or push open.

Fig. 6 expresses and can be used in melt shown in Figure 4 and extrude the another kind of manifold that blows in the drawing-die tool.Manifold 103 has the body portion that two ends import 105 and 107 are arranged 104 of generally tubular.Body portion 104 is by fixing center ring 108 and two rotating end ring 109 supportings.The notch 110 of taper and 112 forms paths, on one side thus its flow behavior can keep the ring 108 of centre to maintain static the two ends of torque tube body portion 104 by the ring 109 that rotates two ends and the tapering that passes through that changes notch 110 and 112 is adjusted.Reversing a moderate relatively amount just can make air-flow character that sizable variation takes place.

Fig. 7 can be used on melt shown in Figure 4 to extrude the schematic diagram that blows the another kind of manifold in the drawing-die tool.Manifold 120 has the body portion that two ends import 127 and 129 are arranged 121 of generally tubular.Body portion 121 is by 125 supportings of two end ring.A pair of movable baffle plate 122 and 123 partly covers notch 128.Baffle plate 122 and 123 can pivot around hinge turning point 124.Thereby the distribution character of manifold 120 can be adjusted around the tapering that passes through of hinge turning point 124 motions change expose portion of notch 128 by making baffle plate 122 and 123.

Fig. 8 expresses and can be used on melt shown in Figure 4 and extrude the another kind of manifold that blows in the drawing-die tool.Manifold 130 is that entrance point 134 other ends are that the section of a pipe 132 of blind end 136 constitutes by one one end.Two rings 114 as leg keep pipe 132 not contact with the hole wall of hole 84a and 84b.Conical rebate 140 forms paths 142, and its distribution character can be by sliding into or skid off hole 84a to pipe 132 and 84b adjusts.

The people who is familiar with this area can recognize, can adopt the fluid attenuating distribution passage of different shape and size among the present invention, and can adjust the distribution character of such path with various guiding mechanisms or method.When using air as fluid attenuating, path can preferably adapt to the about 20 air volume flows to every centimetre of die length of about 100 Liter Per Minutes.Like this, melt that two parallel fluid attenuating manifolds are arranged is extruded and is blown the drawing-die tool and can preferably adapt to the about 40 air volume flows to every centimetre of die length of about 200 Liter Per Minutes.Preferably, the temperature that can make the fluid attenuating in each fluid passage by adjustment along the width of mould remain on ± 5 ℃ within.More preferably can remain on ± 3 ℃ within.Preferably, can be with simple machine tool and must pull down melt hardly and extrude the heat screen, thermal insulation board and other part that blow the drawing-die tool and just can adjust.More preferably, can extrude to blow to be pulled through in the journey at melt and adjust.If original meaning can be adjusted automatically with the characteristic of the state of the sensor that is suitable for and controller and suitable feedback mechanism monitoring mould or non-textile fabric.

The people who is familiar with this area can understand, and melt of the present invention is extruded and blown the drawing-die tool and can comprise additional (for example auxiliary) fluid attenuating stream, makes itself and one or several main fluid attenuating stream cooperate in harmony, and carries out melt jointly and extrudes to blow and draw.For example, melt of the present invention is extruded and is blown the drawing-die tool and can comprise one or several auxiliary air path, and their distribution character also can be adjusted as described above.

Especially preferably, be used in melt of the present invention and extrude the melt that blows in the drawing-die tool and extrude to blow and draw mold cavity to be illustrated in exercise question that 2002.06.20 submits to the application Serial No.10/177 that awaits the reply jointly, in 446 for " bondedfibre fabric and formed nonwoven fabric (NONWOVEN WEB AND NONWON WEBS MADE THEREWITH) ".Preferably, can embark on journey the described mold cavity of this article side by side or vertical in a pile stacked and be used to make the wideer or thicker non-textile fabric that to produce than with a single mold cavity.

Preferable, with the planetary gear measuring pump fiber forming material being supplied to melt of the present invention extrudes and blows the drawing-die tool, this pump for example is illustrated in exercise question that 2002.06.20 submits to the application Serial No.10/177 that awaits the reply jointly for " adopting the meltblowing apparatus (MELTBLOWING APPARATUS EMPLOYING PLANETARYGEAR METERING PUMP) of planetary gear measuring pump ", in 419.

The people who is familiar with this area can understand, and melt is extruded and blown the drawing-die tool and need not to be the plane.Melt of the present invention is extruded and is blown the ring mould that drawing device can adopt a symmetrical centre axis, in order to form columnar one group of filament.Also can be the circumference of the mould that a plurality of nonplanar (curved surface) mold cavity is arranged around a cylinder, in order to forming the bigger columnar one group of filament of diameter, the barrel dliameter of the comparable tubular filament that only can form with the ring mould chamber of a single similar depth of the barrel dliameter of this group filament is big.Also can get up a plurality of annular nonwoven dies of the present invention around a symmetrical center line suit, make such layout, can organize the cylindrical shape filament more in order to form multilayer.

Preferable melt of the present invention is extruded and is blown pull system and can come work with a kind of flat Temperature Distribution profile, and this has reduced to the dependence of adjustable hot entering apparatus (for example being installed in the electric heater in the die ontology) or to the dependence of other indemnifying measure of being used to be exported uniformly.The distortion that this can reduce thermal stress in the die ontology thereby can prevent mold cavity, and if deform, will cause that local non-textile fabric basis weight is inhomogeneous.If be ready usefulness, add hot entering apparatus can for mould of the present invention.Can also increase thermal insulation layer, so that in the mould use, control its thermal characteristics.

Preferable melt of the present invention is extruded and is blown pull system and can produce highly non-textile fabric uniformly.If estimate from the sample of the 0.01m2 that cuts down near (should be enough far to avoid edge effect) in the middle of the end of non-textile fabric apart from the edge with a succession of (for example 3 to 10), the homogeneity error that preferable melt of the present invention is extruded the basis weight of blowing the non-textile fabric that pull system produces is about ± and 2%, even be lower than ± 1%.Estimate with the sample of assembling similarly, preferable melt of the present invention is extruded and is blown pull system and can produce and comprise that one deck melt at least blows out the non-textile fabric of fiber, the difference of the polydispersity of this layer fiber and average fiber polydispersity is no more than ± and 5%, even preferably be no more than ± 3%.

Extrude with melt of the present invention and to blow pull system and various synthetic or natural fiber forming materials can be made non-textile fabric.Preferable synthetic material comprises the mixture or the compound of polyethylene, polypropylene, polybutene, polystyrene, polyethylene terephthalate, polybutylene terepthatlate, the linear polyamide such as nylon 6 or nylon 11, polyurethane, poly-(4 methylpentene 1) and these materials.Preferable natural material comprises asphalt or retinasphal (for example being used to make carbon fiber).Fiber forming material can be molten state or be added with appropriate solvent.Single polymers of various activity also can be with in the present invention, and they can be by pump or enter or by interreaction in the process of mould.Non-textile fabric can contain fibre blend (for example during fabrication with two shared common die terminations of mold cavity near layout) in an individual layer, also can contain multi-layer fiber mixture (for example using all moulds as shown in Figure 7 during fabrication), or contain one or more layers multi-component fiber (as U.S. Patent No. 6, described in 057,256).

Extrude the diameter that the fiber that blows in the non-textile fabric that pull system makes has multiple size with melt of the present invention.For example, fiber may be an average diameter less than 5 microns even less than 1 micron superfine fibre, and average diameter is less than about 10 microns fine fibre, or average diameter is 25 microns or bigger than crude fibre.

Extrude with melt of the present invention and to blow the non-textile fabric that pull system makes and to comprise additional fibers shape or granular material, as United States Patent(USP) Nos. 3,016,599; 3,971,373 and 4,111, described in 531.Also can add other auxiliary material in the non-textile fabric, such as dyestuff, pigment, filler, abrasive particle, fast light according to stabilizing agent, fire retardant, absorbent, medicine, or the like.The interpolation of these auxiliary materials can be carried out with multiple mode, for example, their are introduced in fiber forming material stream, or they are become in the process of non-textile fabric or be sprayed on the fiber afterwards at fibril aggregation, or lining is on non-textile fabric, or with other known technical method of the people who is familiar with this area.For example, can on non-textile fabric, adorn layer by spray fiber light, to improve the feel character of non-textile fabric.

The thickness of the non-textile fabric of finally making can have wide in range scope.Use for great majority, thickness about 0.05 and 15cm between non-textile fabric be preferable.For some application scenario, can be used as a thicker sheet products to stacked of non-textile fabric two-layer or that multilayer is made separately or make in the lump.For example, can be laminated into a SMS structure to non-textile fabric layer and another the centrifugal bonding fibrage (such as U.S. Patent No. 6,182, described in 732) that a centrifugal bonding fibrage, melt are blown out.Extrude with melt of the present invention and to blow pull system and also can make non-textile fabric like this, exactly fibre stream is deposited on and will constitutes on another sheet material of a part of the non-textile fabric of finally making, on one deck permeability non-textile fabric.Also can such as impervious film, be layered on the non-textile fabric by mechanical joint, heat fused or bonding other works.

Can also non-textile fabric that assemble back formation be further processed, for example, it is compacted to causes a little bonding degree, in order to control the capillarity of non-textile fabric with heat and pressure, or on non-textile fabric, extrude pattern, or increase the maintenance fastness of bulk material on it.Can also be by in fibroplastic process, filling with electric charge to fiber, this way such as U.S. Patent No. 4,215, described in 682, perhaps after forming, non-textile fabric fills with electric charge this way such as U.S. Patent No. 3 to non-textile fabric, 571, described in 679, make non-textile fabric have static, to strengthen its strainability.

Extrude with melt of the present invention and to blow the non-textile fabric that pull system makes and to have been widely used, comprise as crossing filter medium and filters, medical fibre goods, amenities, asphalt felt, clothes with fibre, heat insulation or sound insulating material, battery separator and insulating layer of capacitor.

Obviously, the people who is familiar with this area can make various modification and change to the present invention within the spirit and scope of the present invention.So, the present invention can not be limited to the content of setting forth just to illustrative purposes herein.

Claims

1. a melt is extruded and is blown drawing device, comprising:

A) melt is extruded and is blown the drawing-die tool, and this melt is extruded and blown drawing-die and have the outlet of (i) many filaments and (ii) many fluid attenuating flow channels, exports fluids near many fluid attenuatings of described many filaments outlets on these flow channels and the mould and is communicated with;

B) fluid manifold that is communicated with described many flow channel fluids, described fluid manifold has at least one fluid attenuating import; And

C) the fluid attenuating distribution passage between the fluid attenuating outlet of described manifold entrance and correspondence, it is characterized in that, for the temperature that makes the fluid attenuating in the described flow channel is more even, can when described mould of assembling and fluid manifold, change the distribution character of described path.

2. device as claimed in claim 1 is characterized in that, can described fluid attenuating be equated basically in the temperature in described many fluid attenuatings exit by changing described distribution character.

3. device as claimed in claim 1 or 2 is characterized in that, can change described distribution character when described mould is in running order.

4. as the described device of the arbitrary claim in front, it is characterized in that described mould has a width, described fluid manifold has a center line, and described fluid manifold extends and its first end and second end all have the fluid attenuating import along the width of described mould.

5. device as claimed in claim 4, it is characterized in that, described path comprises the elongated fluid notch of the width that extends described mould, the volume flow of fluid attenuating that flows through described notch in described midline for maximum and be changed to minimum continuously to described import department.

6. as the described device of arbitrary claim in the claim 1 to 3, it is characterized in that described mould has a width, described fluid manifold extends and its first end has the fluid attenuating import and its second end seals along the width of described mould.

7. as the described device of the arbitrary claim in front, it is characterized in that described mould has a width, described path comprises the pipeline that extends and have the sidewall that has conical rebate along the width of described mould.

8. device as claimed in claim 7 is characterized in that, can change the mass flow of the fluid attenuating that flows through described path by the width that changes described notch.

9. as the described device of the arbitrary claim in front, it is characterized in that, described fluid attenuating is an air, described distribution character can be changed into the volume of air flow that adapts to every centimetre of path-length of 20-100 Liter Per Minute, simultaneously can with the temperature of the fluid attenuating in the described flow channel along the width of described mould remain on ± 5 ℃ within.

10. method that is used to make fibrous non-textile fabric, it comprises:

A) fiber forming material is flow through as the described device of the arbitrary claim in front;

B) make fluid attenuating flow at least one import of described fluid manifold; And

C) when assembling described mould and fluid manifold, change the distribution character of described fluid passage, so that the temperature of the fluid attenuating in the described flow channel is more even.